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Maximize your system's performance

AudioControl designed the EQX for one purpose  to make your car audio system sound better. This 2-channel equalizer features 13 bands of adjustment for sonic fine tuning, along with a 2-way crossover that allows you to add a powered sub to your setup. And speaker-level inputs allow you to connect the EQX to just about any car stereo, even to factory amps up to 400 watts.

Pinpoint bass equalization

Most car audio problems occur in the bass frequencies, so the EQX gives you six bands of equalization between 31.5 and 180 Hz, along with a rolloff filter that keeps bass below the range of human hearing out of your subwoofer system. You also get seven bands of equalization at octave intervals from 250 Hz all the way up to 16,000 Hz.

Easy setup

The 2-way crossover offers one set of inputs, along with three sets of outputs: full range, high-pass, and low-pass. The crossover point is set at 90 Hz, but you can changer the crossover point by buying another AudioControl module, or by modifying the module installed in your EQX.

Once connected, the EQX makes it easy  turn up the input gain knobs until the indicator light flickers, adjust the output knobs until the light indicates a 2-volt output, and you're all set. Balanced inputs reject noise caused by your vehicle's electrical system.

Terminal Blocks: The power/ground/remote terminal and the
speaker level input terminals are removable; the wiring is attached to the
block, then the block is plugged into the EQX. The terminal block will
accommodate wire up to 12 gauge.

Crossover: The crossover
point between the high-pass and low-pass outputs is 90 Hz and the crossover
slope is 24 dB/octave. The crossover point is governed by a replaceable
chip, so it can be modified.

Subsonic Filter: The subsonic filter crossover point is 33
Hz and the crossover slope is 18 dB/octave. The crossover point is governed by a replaceable chip, so it can be
modified.

Bridging Output: The mono
and inverted low-pass outputs can be used to bridge many amplifiers that don't
have internal bridging circuitry.

Bypass: The bypass switch
allows you to instantly bypass all the EQ adjustments.

Inputs and Outputs:

Line Input: stereo
RCA, balanced

Speaker Input:
removable stereo terminal block

Full Range Output:
stereo RCA, not crossed over

High-Pass Output:
stereo RCA, frequencies above the crossover point

Low-Pass Output:
stereo RCA, frequencies below the crossover point

Mono/Bridged Output:
two RCA, one mono, the other inverted

Power Input: removable
terminal block

Specifications:

Maximum Output: 9.5 volts RMS/13 volts peak

Frequency response: 10 Hz-20 kHz; ±1 dB

THD: 0.005%

S/N Ratio: 110dB

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AudioControl EQX

Overall very happy with the install - in a 2013 Nissan Frontier being fed from the speaker level outputs of the factory head unit which then feeds a 4 channel Alpine amp. Did all of the initial adjustments using the RTA function of the Audio Tools app on an IPAD / pink noise and then some final adjustments by ear with music. All of the boominess of the low end is now gone and bass notes are discernible in the music - the mid-range and highs are well balanced. The Alpine amp feeds the 2 front speakers (Focal 165VB's which are absolutely wonderful) and 2 channels bridged feed a Pioneer sub. Using an RTA for adjustment does make a difference - I enjoy a wide variety of music and all of sounds excellent now.

I have always replaced the head unit in previous installs but with since this head unit had all of the features I wanted I went this route with no regrets.

Pros:Excellent sound form the factory head unit / truck acoustics and fairly easy to adjust.

Good design, build and features

Although the JL Audio Clean Sweep flattened out the output from my GM
factory head unit, it's not designed to match the system output to the
vehicle (in this case, a 2005 Tahoe). The EQX is in the chain right after the
Clean Sweep and replaced a cheaper (in every way) graphic EQ with
crossover which did not have enough fine control over the lower ranges to
fix problems in a large vehicle where the ambient noise is pretty low
frequency. The 1/2 octave control points for the low frequency output did
the trick. I only wish that there were 1/2 octave intervals for the high-pass
end, as well - but it still does a very nice job. I have (and highly recommend)
a 1/3 octave RTA with reference mic and used this to "pink" the system. The
only music source I listen to is my beloved Kenwood Music Keg (with
lossless FLAC files). The EQX, coupled with a four-channel amp for the
doors (Polk Audio) and a two-channel amp for the JL Audio center console
sub, comes much closer to the audiophile sound desired. This unit is
expensive and on-line dealers are not over-abundant, but it is an excellent
piece of equipment.